苹果收不到验证码怎样设置 C#创建简单的验证码操作

C#创建简单的验证码操作  

　　首先 创建一个CLASS类 然后需要add Reference的方式添加 System Drawing（画画的类）    方法代码如下     /// <summary>    /// 定义显示的随机字符    /// </summary>    /// <param name= strList ></param>    /// <returns></returns>    private string imageStr(char[] strList)        {

　　if (strList == null)                strList = ABCDEFGHIJKLMNOPQRSTUVWXYZ ToCharArray();

　　int codeLengh = ;            string radomCode = ;            Random r = new Random();            for (int i = ; i < codeLengh;i++)            {                radomCode += strList[r Next(strList Length)];            }            return radomCode;        }

　　/// <summary>    /// 创建随机验证字符的IMAGE 并保存 同时返回随机字符串    /// </summary>    /// <param name= iWidth >图片宽度 时 默认为 </param>    /// <param name= iHeight >图片高度 时 默认为 </param>    /// <param name= font >字符字体 null时 默认为 Arial FontStyle Bold</param>    /// <param name= sb >字符颜色 null时 默认为红</param>    /// <param name= ImagePath >需要保存的文件绝对路径</param>    /// <param name= strList >随即字符库 null时 默认为 A Z</param>    /// <returns>返回随机字符串</returns>        public string createImgWithStr(int iWidth int iHeight Font font SolidBrush sb string ImagePath char[] strList)        {            if (font == null)                font = new Font( Arial FontStyle Bold);            if (sb == null)                sb = new SolidBrush(Color Red);            if (iWidth == )                iWidth = ;            if (iHeight == )                iHeight = ;            //得到随机字符串            string imageString = imageStr(strList);            //定义横向竖向都画 跳线            int lineCount = ;            这 支笔用来画线条的            Pen pen = new Pen(Color Gold );            Pen pen = new Pen(Color Black );    //定义图片            Bitmap image = new Bitmap(iWidth iHeight);            //跟J ME一样的画笔            Graphics g = Graphics FromImage(image);            //先画背景色 当然你可以自定义下            g Clear(ColorTranslator FromHtml( #F F F ));            //确定写字的落点            Rectangle rect = new Rectangle( iWidth iHeight);

　　Random r = new Random();

　　//默认随机画横向竖向 条线            for(int i = ;i<lineCount;i++)            {                Point p = new Point( r Next(iHeight));                Point p = new Point(iWidth r Next(iHeight));                Point p = new Point(r Next(iWidth) );                Point p = new Point(r Next(iWidth) iHeight);                g DrawLine(pen p p );                g DrawLine(pen p p );            }            //写字            g DrawString(imageString font sb rect); //删除源文件            if (File Exists(ImagePath))                File Delete(ImagePath);            //保存文件 我定义为jpeg格式            image Save(ImagePath System Drawing Imaging ImageFormat Jpeg);            //释放资源            g Dispose();            image Dispose();

　　return imageString;        }    另外 我在实际运用过程中总是发现重新生成了图片 但是显示却还是以前那张